Circuit board and optical module

Abstract

The embodiment of the present invention discloses a circuit board and an optical module. The circuit board of the invention is applied into an optical module. The circuit board is provided with a laser driving chip and a filter capacitor unit; the laser driving chip is provided with a CDR (Clock and data recovery) circuit; The CDR circuit is provided with a frequency-locking pin and a reference ground pin; the circuit board is also provided with a ground layer, an insulation layer and a wiring layer which are stacked together; one end of the filter capacitor unit is connected with the frequency-locking pin through the first wire of the wiring layer, and the other end of the filter capacitor unit is connected with the reference ground pin through the second wire of the wiring layer; and a node on the second wire is connected with the ground layer through a via hole, so that the filter capacitor unit and the reference ground pin are grounded. With the circuit board and optical module adopted, the problem of poor working stability of an existing optical module under the extreme condition of the CDR circuit of the laser driving chip can be solved.

Description

technical field [0001] The invention relates to the technical field of optical communication, in particular to a circuit board and an optical module. Background technique [0002] In optical communication, the optical module can realize photoelectric conversion. With the rapid development of the optical communication industry, the transmission rate and distance of the communication network have increased significantly, and the dispersion and link attenuation have become more serious. High requirements, using a laser driver chip with clock and data recovery (Clock and data recovery, CDR) function, can realize clock recovery extraction, so that the distorted signal can be recovered, improve the signal quality, improve the sensitivity of signal recognition, and increase the link margin to improve robustness. [0003] The CDR technology integrated in the laser driver chip of the optical module is relatively mature, see figure 1 As shown in the optical module 101, one end of th...

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Problems solved by technology

[0010] The purpose of the embodiment of the present invention is to provide a circuit board and an optical module, which is used to solve the problem of poor working stability of the CDR circuit of the laser driver chip in the harsh low temperature environment in the existing optical module

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